19 replies to this topic

[Gaz66]

I cant understand why they put valve seats in and guides then dont bother with the easy stuff like valves and springs.
Surely it will be more saleable complete and ready to fit?

[DeadSquare]

I cant understand why they put valve seats in and guides then dont bother with the easy stuff like valves and springs.
Surely it will be more saleable complete and ready to fit?

On the 15/02/2024, under the post "Mini 998 16 valve conversion", "tobytronic"  proposes converting Kawasaki cylinder heads for around £500-00.

 

I have moved it next to this post.

Edited by DeadSquare, 23 February 2026 - 04:26 PM.

[Shooter63]

I'm pretty sure these cast 7 port heads all come a USA company called Pierce Manifolds, they also do some nice manifolds for the A series engine, it might be worth going to them direct, I've no idea what the import tariffs will be though.

Shooter

Didn't know they all come from the same place. I contacted Pierce already because it would have been much cheaper even with import tax, but the reply was that there is no stock and he won't be making any more.

That's interesting to know, I was working with a design engineer to produce a highly improved version of a 7 port head, but we stopped due to the existing version that people seemed to be happy to buy.

Shooter

[scottyboy805]

 

 

I'm pretty sure these cast 7 port heads all come a USA company called Pierce Manifolds, they also do some nice manifolds for the A series engine, it might be worth going to them direct, I've no idea what the import tariffs will be though.

Shooter

Didn't know they all come from the same place. I contacted Pierce already because it would have been much cheaper even with import tax, but the reply was that there is no stock and he won't be making any more.

That's interesting to know, I was working with a design engineer to produce a highly improved version of a 7 port head, but we stopped due to the existing version that people seemed to be happy to buy.

Shooter

 

Well seems like there is a gap in the market currently because almost everywhere I looked or contacted is out of stock or stopped selling them. I am sure there must still be demand for them.

[Gaz66]

Theres a big demand for 8 ports but it seems the problem is getting them cast according to Rich at minispares.
Lots are scrapped according to him due to bad castings.